plumbing vs water carrier

plumbing

noun
  • The pipes, together with the joints, tanks, stopcocks, taps, and other fixtures of a water, gas, or sewage system in a house or other building. 

  • A system of vessels or ducts in the human body, especially the genitourinary system. 

  • The trade or occupation of a plumber. 

  • Practical, concrete work serving to support other work. 

  • A Murasugi sum where each disk summed along has its boundary subdivided into four segments. 

water carrier

noun
  • An arrangement of wires on which a bucket of water, raised from a well, etc., may be conveyed wherever required, as to a house. 

  • A pipe or tube that conveys water. 

  • A person who carries water from a spring or well, especially in antiquity and pre-modern era when it was a common job. 

  • A transportation ship that is water-based. 

  • An individual doing simple, ordinary work, usually in opposition to somebody considered more valuable. 

  • Aquarius, or a symbol for it. 

  • A domestique. 

How often have the words plumbing and water carrier occurred in a corpus of books? (source: Google Ngram Viewer )